Worried

Y’all my period is light. It’s day 3 and it’s barely there. But I read it could be due to lack of ovulating. I took an opk this month. Three times. It was positive on the 3rd and I ovulated on the 4th...unless I didn’t ovulate..? I’m only curious because I had sex during my fertile week but didn’t end up pregnant and I’m just surprised by that. We’re actually trying for baby number 3 starting next July (I got married this month so of course we had sex). If I feel like I’m not ovulating by next July, should I talk to my OB about it? Just as a concern, that is. I know it’s only like a 33% chance every month but I’ve had two kids. I’m just wondering if my ovulation got messed up. I never have the runny CM around ovulation, at least I don’t notice it or something 🥵